Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

| Clique na imagem para ampliar |

Zener Coupling (CB4139E)
According to the consulted American publication of the 1980s, a zener diode can be used for DC...
RIAA Preamplifier III (CB958E)
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
Horizontal Bar TV Generator (CB524E)
This circuit produces horizontal lines or bars in a analog TV tuned between channels 2 and 5. L1...